Disclosed herein is an antenna device for receiving a broadcast wave in each of a first required frequency band and a second required frequency band, the antenna device including: an earphone cable including an audio signal line and a ground line; and an antenna element cable including a coaxial line formed by covering a core line with an insulator and further covering the insulator with an outer covering conductor, and an audio signal line, a leading end of the antenna element cable being connected to the earphone cable via a relay circuit, and a base end of the antenna element cable being connected to a device including a tuner via an antenna switching circuit.